Beversible fozjb-cycle engine



J. KEISTER.

REVERSIBLE FOUR-CYCLE ENGINE.

APPLICATION FILED JUNE 13. l9l8.

,3 1 5, 844.. Patented Sept. 9, i919.

WITNESSES INVEN TO/i J I a @7 Easter A TTORNEYS JAMES KEISTER, 0FSTEUBENVILLE, OHIO.

REVERSIBLE FOUR-CYCLE ENGINE.

Specification of Letters Patent.

Patented Sept. 9, 1919.

Application filed June 13, 1918. Serial No. 239,862.

To all whom it may concern:

Be it known that I, JAMES KEISTER, a citizen of the United States, and aresident of Steubenville, in the county of Jefferson and tate of Ohio,have invented a new and Improved Reversible F our-Cycle Engine, of whichthe following is a full, clear, and exact description.

This invention relates to a four-cycle engine and has to deal moreparticularly with improvements relating to an engine of the typedisclosed in United States Letters Patent 1,237,054, granted to meAugust 14, 1917.

The object of the present invention is to improve and simplify theconstruction and operation of engines of this type so as to be reliableand eflicient in use, comparatively simple and inexpensive tomanufacture, and so designed that the inlet and exhaust can be on thesame side.

Another object of the invention is to provide an engine of the singlesleeve reciprocatory valve type which has only one aperture for theinlet of the explosive charge and the outlet of the spent gases, therebeing a novel valve device for controlling the admission of the mixtureto the port of the sleeve valve and the outlet of the exhaust gases.

With such and other objects in View, the invention comprises variousnovel features of construction and arrangement of parts which will beset forth with particularity in the following description and claimsappended hereto.

In the accompanying drawing the figure illustrates a central verticalsection of the engine.

Referring to the drawing, 1 designates the engine cylinder, 2'thereciprocatory piston therein, 3 the sleeve valve which has a sliding fitwith the piston and cylinder, the piston being connected with the crank4 of the main shaft 5, which latter is connected with a secondary shaft6 throu 'h a half speed transmission 7, which secondary shaft has acrank 8 or equivalent means connected by a link 9 with the sleeve valve3, whereby the latter is reciprocated at half the rate of the piston 2,there being four strokes of the piston to two strokes of the sleevevalve.

At one side of the cylinder 1 is a valve chamber 10 connected by a port11 in the cylinder wall and a port 12 in the sleeve valve with theexplosion chamber 13 of the engine. Connected with the chamber 10 is aninlet conduit 14 and an exhaust conduit 15. The chamber 10 iscylindrical and has a cover 16 at the top, and under this cover is apiston valve 17 controlling the exhaust, and a mushroom valve 18 islocated under the valve 17 to control the inlet of the explosivecharges. A port 19 in the side of the valve chamber 10 is closed by thepiston valve 17 when the latter is in its lowermost or normal position.Thus, when the piston 2 moves downwardly to draw in a charge of mixture,the valve 18 opens for the fuel to flow in from the conduit 14, andcommunication with the exhaust conduit 15 is cut off by the valve 17. Onthe next up stroke the sleeve valve 3 moves to throw the ports 11 and 12out of register, and consequently the fuel charge is compressed. Theport 11 remains closed during the next down stroke, while the expandedgases fired by the spark plug 20 act on the piston. At the end of thisstroke the ports 12 and 11 again register, so that the products ofcombustion will be forced out through the ports 12, 11, chamber 10, port19 and conduit 15, the valve 17 automatically opening under the pressureof the exhaust gases.

As the valves are entirely automatic in operation and as the sleevevalve has a fixed relation to the movement of the piston, it is obviousthat the engine can operate to turn the crank shaft in either direction.

From the foregoing description taken in connection with the accompanyingdrawing, the advantages of the construction and method of operation willbe readily understood by those skilled in the art to which the inventionappertains, and while I have described the principle of operation,together with the device which I now consider to be the best embodimentthereof, I

desire to have it understood that the device port, a valve chambercommunicating with the cylinder port, a check valve in the said chamberand arranged to open toward the cylinder port, a mixture supply conduitcommunicating with the chamber through the said valve, an exhaustconduit, a port between the exhaust conduit and valve chamber, and apiston valve in the valve chamber directly above the check valvenormally closing the last-mentioned port and adapted to automaticallyopen under the pressure of the outfiowing exhaust gases when the sleevevalve and cylinder ports register on the exhaust stroke of the piston.

2. In an engine, the combination with a cylinder having a single portfor the inlet of the explosive charge and the outlet of the exhaustgases, a sleeve valve in the cylinder and having a single port adaptedto move in and out of register with the cylinder port,

and a piston in the sleeve valve, of a cylindrical valve chambercommunicating with the cylinder port and having an exhaust port in itsopposite side out of alinement with the cylinder port, an inlet conduitleading to the lower portion of the valve chamber, an upwardly openingcheck valve in the lower part of the chamber and controlling said inletconduit, an exhaust conduit leading from the exhaust port of the saidchamber and a gravity piston valve in the upper part of the chamberdirectly above the check valve, said piston valve normally closing theexhaust port and adapted to automatically open under the pressure of theoutflowing exhaust gases when the sleeve valve and cylinder portsregister on the exhaust stroke of the piston.

J AMES KEISTER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

